mirror of https://github.com/django/django.git
Fixed #9745 -- Added the `GeoQuerySet` methods `snap_to_grid` and `geojson`.
git-svn-id: http://code.djangoproject.com/svn/django/trunk@10369 bcc190cf-cafb-0310-a4f2-bffc1f526a37
This commit is contained in:
Justin Bronn
parent
9828557731
commit
8d42902f19
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@ -19,6 +19,7 @@ SpatialBackend = BaseSpatialBackend(name='postgis', postgis=True,
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envelope=ENVELOPE,
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extent=EXTENT,
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gis_terms=POSTGIS_TERMS,
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geojson=ASGEOJSON,
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gml=ASGML,
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intersection=INTERSECTION,
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kml=ASKML,
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@ -32,6 +33,7 @@ SpatialBackend = BaseSpatialBackend(name='postgis', postgis=True,
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point_on_surface=POINT_ON_SURFACE,
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scale=SCALE,
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select=GEOM_SELECT,
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snap_to_grid=SNAP_TO_GRID,
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svg=ASSVG,
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sym_difference=SYM_DIFFERENCE,
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transform=TRANSFORM,
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@ -38,6 +38,7 @@ if MAJOR_VERSION >= 1:
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# Functions used by the GeoManager & GeoQuerySet
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AREA = get_func('Area')
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ASGEOJSON = get_func('AsGeoJson')
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ASKML = get_func('AsKML')
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ASGML = get_func('AsGML')
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ASSVG = get_func('AsSVG')
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@ -61,11 +62,12 @@ if MAJOR_VERSION >= 1:
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PERIMETER = get_func('Perimeter')
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POINT_ON_SURFACE = get_func('PointOnSurface')
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SCALE = get_func('Scale')
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SNAP_TO_GRID = get_func('SnapToGrid')
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SYM_DIFFERENCE = get_func('SymDifference')
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TRANSFORM = get_func('Transform')
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TRANSLATE = get_func('Translate')
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# Special cases for union and KML methods.
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# Special cases for union, KML, and GeoJSON methods.
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if MINOR_VERSION1 < 3:
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UNIONAGG = 'GeomUnion'
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UNION = 'Union'
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@ -75,6 +77,11 @@ if MAJOR_VERSION >= 1:
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if MINOR_VERSION1 == 1:
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ASKML = False
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# Only 1.3.4+ have AsGeoJson.
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if (MINOR_VERSION1 < 3 or
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(MINOR_VERSION1 == 3 and MINOR_VERSION2 < 4)):
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ASGEOJSON = False
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else:
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raise NotImplementedError('PostGIS versions < 1.0 are not supported.')
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@ -30,6 +30,9 @@ class GeoManager(Manager):
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def extent(self, *args, **kwargs):
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return self.get_query_set().extent(*args, **kwargs)
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def geojson(self, *args, **kwargs):
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return self.get_query_set().geojson(*args, **kwargs)
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def gml(self, *args, **kwargs):
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return self.get_query_set().gml(*args, **kwargs)
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@ -63,6 +66,9 @@ class GeoManager(Manager):
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def scale(self, *args, **kwargs):
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return self.get_query_set().scale(*args, **kwargs)
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def snap_to_grid(self, *args, **kwargs):
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return self.get_query_set().snap_to_grid(*args, **kwargs)
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def svg(self, *args, **kwargs):
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return self.get_query_set().svg(*args, **kwargs)
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@ -103,6 +103,32 @@ class GeoQuerySet(QuerySet):
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"""
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return self._spatial_aggregate(aggregates.Extent, **kwargs)
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def geojson(self, precision=8, crs=False, bbox=False, **kwargs):
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"""
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Returns a GeoJSON representation of the geomtry field in a `geojson`
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attribute on each element of the GeoQuerySet.
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The `crs` and `bbox` keywords may be set to True if the users wants
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the coordinate reference system and the bounding box to be included
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in the GeoJSON representation of the geometry.
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"""
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if not SpatialBackend.postgis or not SpatialBackend.geojson:
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raise NotImplementedError('Only PostGIS 1.3.4+ supports GeoJSON serialization.')
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if not isinstance(precision, (int, long)):
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raise TypeError('Precision keyword must be set with an integer.')
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# Setting the options flag
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options = 0
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if crs and bbox: options = 3
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elif crs: options = 1
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elif bbox: options = 2
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s = {'desc' : 'GeoJSON',
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'procedure_args' : {'precision' : precision, 'options' : options},
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'procedure_fmt' : '%(geo_col)s,%(precision)s,%(options)s',
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}
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return self._spatial_attribute('geojson', s, **kwargs)
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def gml(self, precision=8, version=2, **kwargs):
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"""
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Returns GML representation of the given field in a `gml` attribute
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@ -213,6 +239,42 @@ class GeoQuerySet(QuerySet):
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}
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return self._spatial_attribute('scale', s, **kwargs)
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def snap_to_grid(self, *args, **kwargs):
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"""
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Snap all points of the input geometry to the grid. How the
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geometry is snapped to the grid depends on how many arguments
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were given:
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- 1 argument : A single size to snap both the X and Y grids to.
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- 2 arguments: X and Y sizes to snap the grid to.
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- 4 arguments: X, Y sizes and the X, Y origins.
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"""
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if False in [isinstance(arg, (float, int, long)) for arg in args]:
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raise TypeError('Size argument(s) for the grid must be a float or integer values.')
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nargs = len(args)
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if nargs == 1:
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size = args[0]
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procedure_fmt = '%(geo_col)s,%(size)s'
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procedure_args = {'size' : size}
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elif nargs == 2:
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xsize, ysize = args
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procedure_fmt = '%(geo_col)s,%(xsize)s,%(ysize)s'
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procedure_args = {'xsize' : xsize, 'ysize' : ysize}
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elif nargs == 4:
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xsize, ysize, xorigin, yorigin = args
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procedure_fmt = '%(geo_col)s,%(xorigin)s,%(yorigin)s,%(xsize)s,%(ysize)s'
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procedure_args = {'xsize' : xsize, 'ysize' : ysize,
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'xorigin' : xorigin, 'yorigin' : yorigin}
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else:
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raise ValueError('Must provide 1, 2, or 4 arguments to `snap_to_grid`.')
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s = {'procedure_fmt' : procedure_fmt,
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'procedure_args' : procedure_args,
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'select_field' : GeomField(),
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}
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return self._spatial_attribute('snap_to_grid', s, **kwargs)
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def svg(self, **kwargs):
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"""
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Returns SVG representation of the geographic field in a `svg`
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@ -119,7 +119,7 @@ class GeoModelTest(unittest.TestCase):
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@no_oracle # Oracle does not support KML.
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@no_spatialite # SpatiaLite does not support KML.
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def test03a_kml(self):
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"Testing KML output from the database using GeoManager.kml()."
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"Testing KML output from the database using GeoQuerySet.kml()."
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if DISABLE: return
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# Should throw a TypeError when trying to obtain KML from a
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# non-geometry field.
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@ -145,7 +145,7 @@ class GeoModelTest(unittest.TestCase):
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@no_spatialite # SpatiaLite does not support GML.
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def test03b_gml(self):
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"Testing GML output from the database using GeoManager.gml()."
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"Testing GML output from the database using GeoQuerySet.gml()."
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if DISABLE: return
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# Should throw a TypeError when tyring to obtain GML from a
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# non-geometry field.
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@ -164,6 +164,38 @@ class GeoModelTest(unittest.TestCase):
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for ptown in [ptown1, ptown2]:
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self.assertEqual('<gml:Point srsName="EPSG:4326"><gml:coordinates>-104.609252,38.255001</gml:coordinates></gml:Point>', ptown.gml)
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@no_spatialite
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@no_oracle
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def test03c_geojson(self):
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"Testing GeoJSON output from the database using GeoQuerySet.geojson()."
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if DISABLE: return
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# PostGIS only supports GeoJSON on 1.3.4+
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if not SpatialBackend.geojson:
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return
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# Precision argument should only be an integer
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self.assertRaises(TypeError, City.objects.geojson, precision='foo')
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# Reference queries and values.
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# SELECT ST_AsGeoJson("geoapp_city"."point", 8, 0) FROM "geoapp_city" WHERE "geoapp_city"."name" = 'Pueblo';
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json = '{"type":"Point","coordinates":[-104.60925200,38.25500100]}'
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self.assertEqual(City.objects.geojson().get(name='Pueblo').geojson, json)
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# SELECT ST_AsGeoJson("geoapp_city"."point", 8, 1) FROM "geoapp_city" WHERE "geoapp_city"."name" = 'Houston';
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json = '{"type":"Point","crs":{"type":"EPSG","properties":{"EPSG":4326}},"coordinates":[-95.36315100,29.76337400]}'
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# This time we want to include the CRS by using the `crs` keyword.
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self.assertEqual(City.objects.geojson(crs=True, model_att='json').get(name='Houston').json, json)
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# SELECT ST_AsGeoJson("geoapp_city"."point", 8, 2) FROM "geoapp_city" WHERE "geoapp_city"."name" = 'Victoria';
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json = '{"type":"Point","bbox":[-123.30519600,48.46261100,-123.30519600,48.46261100],"coordinates":[-123.30519600,48.46261100]}'
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# This time we include the bounding box by using the `bbox` keyword.
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self.assertEqual(City.objects.geojson(bbox=True).get(name='Victoria').geojson, json)
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# SELECT ST_AsGeoJson("geoapp_city"."point", 5, 3) FROM "geoapp_city" WHERE "geoapp_city"."name" = 'Chicago';
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json = '{"type":"Point","crs":{"type":"EPSG","properties":{"EPSG":4326}},"bbox":[-87.65018,41.85039,-87.65018,41.85039],"coordinates":[-87.65018,41.85039]}'
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# Finally, we set every available keyword.
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self.assertEqual(City.objects.geojson(bbox=True, crs=True, precision=5).get(name='Chicago').geojson, json)
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def test04_transform(self):
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"Testing the transform() GeoManager method."
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if DISABLE: return
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@ -620,6 +652,46 @@ class GeoModelTest(unittest.TestCase):
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self.assertEqual(1, qs.count())
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for pc in qs: self.assertEqual(32128, pc.point.srid)
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@no_spatialite
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@no_oracle
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def test27_snap_to_grid(self):
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"Testing GeoQuerySet.snap_to_grid()."
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if DISABLE: return
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# Let's try and break snap_to_grid() with bad combinations of arguments.
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for bad_args in ((), range(3), range(5)):
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self.assertRaises(ValueError, Country.objects.snap_to_grid, *bad_args)
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for bad_args in (('1.0',), (1.0, None), tuple(map(unicode, range(4)))):
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self.assertRaises(TypeError, Country.objects.snap_to_grid, *bad_args)
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# Boundary for San Marino, courtesy of Bjorn Sandvik of thematicmapping.org
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# from the world borders dataset he provides.
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wkt = ('MULTIPOLYGON(((12.41580 43.95795,12.45055 43.97972,12.45389 43.98167,'
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'12.46250 43.98472,12.47167 43.98694,12.49278 43.98917,'
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'12.50555 43.98861,12.51000 43.98694,12.51028 43.98277,'
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'12.51167 43.94333,12.51056 43.93916,12.49639 43.92333,'
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'12.49500 43.91472,12.48778 43.90583,12.47444 43.89722,'
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'12.46472 43.89555,12.45917 43.89611,12.41639 43.90472,'
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'12.41222 43.90610,12.40782 43.91366,12.40389 43.92667,'
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'12.40500 43.94833,12.40889 43.95499,12.41580 43.95795)))')
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sm = Country.objects.create(name='San Marino', mpoly=fromstr(wkt))
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# Because floating-point arithmitic isn't exact, we set a tolerance
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# to pass into GEOS `equals_exact`.
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tol = 0.000000001
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# SELECT AsText(ST_SnapToGrid("geoapp_country"."mpoly", 0.1)) FROM "geoapp_country" WHERE "geoapp_country"."name" = 'San Marino';
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ref = fromstr('MULTIPOLYGON(((12.4 44,12.5 44,12.5 43.9,12.4 43.9,12.4 44)))')
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self.failUnless(ref.equals_exact(Country.objects.snap_to_grid(0.1).get(name='San Marino').snap_to_grid, tol))
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# SELECT AsText(ST_SnapToGrid("geoapp_country"."mpoly", 0.05, 0.23)) FROM "geoapp_country" WHERE "geoapp_country"."name" = 'San Marino';
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ref = fromstr('MULTIPOLYGON(((12.4 43.93,12.45 43.93,12.5 43.93,12.45 43.93,12.4 43.93)))')
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self.failUnless(ref.equals_exact(Country.objects.snap_to_grid(0.05, 0.23).get(name='San Marino').snap_to_grid, tol))
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# SELECT AsText(ST_SnapToGrid("geoapp_country"."mpoly", 0.5, 0.17, 0.05, 0.23)) FROM "geoapp_country" WHERE "geoapp_country"."name" = 'San Marino';
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ref = fromstr('MULTIPOLYGON(((12.4 43.87,12.45 43.87,12.45 44.1,12.5 44.1,12.5 43.87,12.45 43.87,12.4 43.87)))')
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self.failUnless(ref.equals_exact(Country.objects.snap_to_grid(0.05, 0.23, 0.5, 0.17).get(name='San Marino').snap_to_grid, tol))
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from test_feeds import GeoFeedTest
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from test_regress import GeoRegressionTests
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